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29-31 March 1994

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Displaying Results 1 - 25 of 112
  • Space Station Freedom, technology applications in vehicle electrical power systems

    Publication Year: 1994, Page(s):2 - 7
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    This paper covers the Space Station Freedom electrical power system (EPS) design and shows how the application of that technology in aircraft (and other vehicles) electrical power distribution systems can reduce weight and volume, and improve reliability and maintainability. The design and development of the Space Station EPS was a major milestone in large-scale space power management and distribu... View full abstract»

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  • Recent advances in power electronics and applications

    Publication Year: 1994, Page(s):8 - 13
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    The advent of high frequency, high power switching devices has resulted in widespread application of power electronic converters for energy conversion and motion control. The use of high speed microcomputers and advanced software architectures has simplified control system design by permitting complex computation and decision making capabilities in the fields of real time motion control. This pape... View full abstract»

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  • Electric vehicles of yesterday carry us into tomorrow

    Publication Year: 1994, Page(s):14 - 16
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (301 KB)

    The first car powered by an electric motor was built in 1847 by Moses Farmer. By 1901, there were over 4,000 electric automobiles. During that time, the electric car dominated the field of transportation over the gasoline and steam powered automobiles for many years. However, the electric motors and controllers in these early cars have made great technical advances, the electric automobile has not... View full abstract»

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  • Is there a bright future for photonics?

    Publication Year: 1994, Page(s):17 - 19
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    Gives a general discussion of the future photonics applications; such as in laser weapons, optical fibre networks, and domestic house applications as in IR motion detectors, and automatic light switches. View full abstract»

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  • Hybrid fuzzy controller designs that use pattern recognition and neural networks

    Publication Year: 1994, Page(s):20 - 25
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (625 KB)

    The author shows one of many ways to build a hybrid model for fuzzy control that uses fuzzy clustering and CNNs as tools. Neither fuzzy control nor CNNs are well-aged, but they are mature enough to bear fruit. Hybrid models can and will have properties that their progenitors do not possess. Not all hybrids will be good, so many testing and evaluation will be necessary. View full abstract»

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  • Electric vehicles-driving the way to a cleaner future

    Publication Year: 1994, Page(s):28 - 30
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (334 KB)

    In the area of emissions reduction, electric vehicles (EVs) show enormous promise. An Electric Power Research Institute (EPRI) study estimates that in typical urban areas, substituting an EV for a gasoline-powered vehicle would reduce the primary emissions levels dramatically. They emit 99% less volatile organic compounds, 99% less CO, 83% less NO/sub x/ and 54% less CO/sub 2/. Here, the author de... View full abstract»

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  • Range extension for electric vehicles

    Publication Year: 1994, Page(s):31 - 36
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    When electric vehicles are discussed with the public, two questions inevitably arise: how far can it go between charges, and how fast can it go? Both of these issues are related in part to the electrical energy stored and the efficiency of conversion from electrical energy to mechanical energy. In practical use many electric vehicle drivers have been known to use only 10-20% of the vehicle's range... View full abstract»

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  • Climate control system for electric vehicles

    Publication Year: 1994, Page(s):37 - 41
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Recognizing the underlying motivation in electric car design to conserve energy and the necessity for effective climate control, a technical solution to minimize energy requirements for both air conditioning and heating to extend the range ofan electric vehicle is needed. Currently. available compressor systems are inadequate in efficiency, size and weight. Here, the authors present a solution to ... View full abstract»

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  • Photovoltaics and the automobile

    Publication Year: 1994, Page(s):42 - 46
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (447 KB)

    For years people have been in love with the automobile. Some people just enjoy using the automobile as transportation while others also enjoy the workings and operation of this fascinating machine. The automobile is not without as problems of pollution and energy consumption. These problems are changing its design and construction. New clean energy sources are being analyzed and applied to power t... View full abstract»

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  • Efficient photovoltaic charging of electric vehicles

    Publication Year: 1994, Page(s):47 - 52
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    The University of South Florida in Tampa, USA, has initiated operation of a photovoltaic (PV) system capable of a 6 kW (peak) output that can be used for simultaneous computer controlled direct DC-DC charging and utility interconnection. The PV DC-DC system is part of the 20 kW (peak), 12 bay Electric Vehicle/Photovoltaic Demonstration and Evaluation Program being conducted at the University and c... View full abstract»

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  • Preparing for the post-petroleum era: what electric vehicle advocates and others need to know about alternative fuel vehicles

    Publication Year: 1994, Page(s):53 - 58
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (698 KB)

    Despite the offer of tax incentives for converting vehicles to alternative fuels, fewer than 8 million alternative fuel vehicles (AFVs) are expected to be placed in service in the next ten years. More than 90 percent of car owners can be expected to continue to rely on imported oil for at least half of their transportation fuel. An optimistic projection estimates that half of the US commercial fle... View full abstract»

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  • Learning in neural networks with Bayesian prototypes

    Publication Year: 1994, Page(s):60 - 64
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (494 KB)

    Given a set of samples of a probability distribution on a set of discrete random variables, we study the problem of constructing a good approximate neural network model of the underlying probability distribution. Our approach is based on an unsupervised learning scheme where the samples are first divided into separate clusters, and each cluster is then coded as a single vector. These Bayesian prot... View full abstract»

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  • Learning situational knowledge through observation of expert performance in a simulation-based environment

    Publication Year: 1994, Page(s):65 - 70
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (638 KB)

    Most knowledge acquisition techniques are best suited for gathering knowledge in a static domain; they are incapable of handling dynamically changing information as is frequently encountered in a real time simulation. This research describes a general methodology for learning implicit situational knowledge by observing the expert while reacting to a real time simulation. The paper outlines an effi... View full abstract»

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  • A performance evaluation of variations to the standard back-propagation algorithm

    Publication Year: 1994, Page(s):71 - 76
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    A number of techniques have been proposed recently, which attempt to improve the generalization capabilities of backpropagation neural networks (BPNNs). Among them, weight-decay, cross-validation, and weight-smoothing are probably the most simple and the most frequently used. This paper presents an empirical performance comparison among the above approaches using two real world databases. In addit... View full abstract»

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  • Systemic alternation of depolarization sites in the postsynaptic membrane: a biomathematical model

    Publication Year: 1994, Page(s):77 - 79
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (349 KB)

    We propose a preliminary mathematical model and simulation of temporally and spatially patterned alternation of postsynaptic depolarization sites as a hypothetical function of structural changes in the target neuron biomembrane. Our model demonstrates that observed state changes in a target neuron are not only a function of phase relationships among excitatory and inhibitory inputs but of where wi... View full abstract»

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  • Application of neural networks to the adaptive routing control and traffic estimation of survivable wireless communication networks

    Publication Year: 1994, Page(s):85 - 91
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (782 KB)

    Problems of estimating and optimizing the behavior of wireless networks, based on the structure of a general stochastic model of the network's discrete-event dynamics, lead to mathematically correct, yet computationally intractable, backward recursive conditions defining the stochastic filter of network state and the optimal routing controls. The structure of the stochastic model of network dynami... View full abstract»

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  • An application of gradient-like dynamics to neural networks

    Publication Year: 1994, Page(s):92 - 96
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    This paper reviews a formalism that enables the dynamics of a broad class of neural networks to be understood. This formalism is then applied to a specific network and the predicted and simulated behavior of the system are compared. The purpose of this work is to utilise a model of the dynamics that also describes the phase space behavior and structural stability of the system. This is achieved by... View full abstract»

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  • Using Bayesian networks for incorporating probabilistic a priori knowledge into Boltzmann machines

    Publication Year: 1994, Page(s):97 - 102
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    We present a method for automatically determining the structure and the connection weights of a Boltzmann machine corresponding to a given Bayesian network representation of a probability distribution on a set of discrete variables. The resulting Boltzmann machine structure can be implemented efficiently on massively parallel hardware, since the structure can be divided into two separate clusters ... View full abstract»

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  • On vision-based robot calibration

    Publication Year: 1994, Page(s):104 - 109
    Cited by:  Papers (1)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    This tutorial, which is on the subject of using hand-mounted cameras for robot calibration, focuses on the basic principles of "one-stage" methods that calibrate simultaneously the robot and the cameras and "two stage" methods that first calibrating the cameras and then calibrating the robot. Distinction is made between stereo and monocular camera systems. The papers addresses the pros and cons of... View full abstract»

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  • Real-time eye feature tracking from a video image sequence using Kalman filter

    Publication Year: 1994, Page(s):110 - 115
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (593 KB)

    Monitoring eye movements using video cameras has the advantage of being nonintrusive, inexpensive and automated. The main objective of this paper is to propose an efficient approach for real-time eye feature tracking from a sequence of eye images. To this end, first we formulate a model for eye feature tracking, which relates the measurements from the eye images to the tracking parameters. In our ... View full abstract»

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  • Nonlinear robust control design without requiring any priori information on the control sign

    Publication Year: 1994, Page(s):116 - 120
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    This paper present a robust control scheme for a second order nonlinear system that have not only additive nonlinear uncertainties but also unknown multiplicative signs. These signs are called control directions since they represent effectively the direction of motion under any given control. Except for the unknown control directions, the second order system satisfies the generalised matching cond... View full abstract»

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  • A new learning control based on the Lyapunov direct method

    Publication Year: 1994, Page(s):121 - 125
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (453 KB)

    This paper illustrates a new learning control design using Lyapunov direct method. It has been shown that under the proposed learning control a class of nonlinear systems is always guaranteed to be be asymptotically stable with respect to the number of trials. The proposed control is also robust in the sense that the exact knowledge of the nonlinear dynamics is not required except for bounding fun... View full abstract»

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  • Attitude compensated electronic compass for aircraft navigation

    Publication Year: 1994, Page(s):126 - 131
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    A magnetic compass has been developed by the Research Laboratory for Avionics System of the University of Florida intended to replace the common mechanical directional gyroscope for aircraft heading indication. The compass is based on an assembly of three mutually orthogonal single-core magnetic sensors, affixed to the fuselage, thus remaining in the aircraft frame of reference. The sensor electro... View full abstract»

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  • Electro-optical sensor packaging overview

    Publication Year: 1994, Page(s):134 - 137
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (329 KB)

    This paper emphasizes the infrared sensor/detector packaging. Electro-optical (E-O) sensor packaging is a challenging task. By its nature, it requires one to complete two missions: 1) to expose the sensing element in order to interact with the environment "transparently" while detecting the surrounding and 2) to protect sensitive electronics from the harsh environment. View full abstract»

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  • A review of self-heating effects on bipolar circuits

    Publication Year: 1994, Page(s):138 - 142
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (383 KB)

    General insights into local-heating effects on the large- and small-signal behaviors of bipolar integrated circuits are provided, and the circuit conditions under which self-heating causes significant errors in simulations are discussed. View full abstract»

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